Harold george rbetkter



To all 'whom t may concern:

Patented Sept. "i9, i922.k

Uil/iE,

flHARoL-rfrsnonen nennen, or GIsBonNn, NEW ZEALAND.

"'CARBURETOR.

Application flied rbuaryga, 191e.` serial ira-274,889.

Be it known that l-lnoLD GrnoiuinREN-k Nnn,a subject of'lcllisilajesty-thei-King of Great Britain, residing at Rutene Road, Gisborne,New Zealand,lrhave inventedcertain new and useful `iinproveniente''inCarburetv make and use thesame.-

ors; and I do hereby declare the following torbe a full, clear, andexact description of the invention, such as will enable others skilledin the art. to whicli'lit appertains to This invention relates toy animproved carburetor, which while automatically keepjtween'two flatsurfacesor walls 7 of the casfing.,y The free ends vof the walls '5 arecaused toconverge and close upon the jet tube 3 and its'needle valve 3by spring action. The

lsaid.,valv'eis carried by the free end of an armS, calledthe needlevalve arm, which is pivoted at 8 and which by the action of the springStends constantly to lift the valve, and to prevent lost motion thereof,as

illustrated' in Figure l'. This lifting tendl enicy is however resistedby -a second arm 9,'called the control arm, which is pivoted at 9, andwhich by the action of the spring 9 ing the proportions ofthe mixtureconstant at ally speeds, .permits these' proportions to be varied`atfwilflfwhile'the carburetor 'is'in fwith the needle valve' arm 8bythe clips or operation.

According to' my invention, C` employ a' choketube of peculiarconstruction com-pris` ing pivotedI wallsA whose free ends are caused byspring action tor'converge andfcloseupo'n the jet tube',-and-lprovidemeans'whereby theoscillation yof thesewalls, due to air pressurecausedbyi enginesuction, will operate a needle valve controlling thejetoriiice the petrol supplyl beingthereby automatically .in-

creased and diminished in direct to the air'supply. p f

In order to permit the proportions of the proportion mixturev to bevaried/"while thecarburetor isf running, I providemeans whereby therange of movement or lift imparted tothe needle valve for a given rangeSoffinovement of the pivoted choke tube walls,imay be varied at will. i

In the annexed drawings in which similar numerals refer to correspondingparts in all the figures Fig. l is a vertical longitudinal sectionalview of a carburetor in accordance with my invention.

Fig. 2 is an end elevational view looking `from the left in Fig. l.

Fig. 3 is a cross section on line F ig. l. Fig. 4 is a horizontalsectional view of the carburetor.

Fig. 5 is a detail View of the modified form ofthe linksr 16,hereinafter referred to. l is a suitable casing, 2 the choke tube, 3 thejet tube and d the induction pipe to engine. The choke tube isconstituted by two spaced walls 5 pivoted at 6 and movable bebe'ars onan adjustable member located betweenk the armsandconsistingof a rollerl() carried 'by a member ll slidably connected slides l2.` The saidmember 1l' is adjustable longitudinally of the arms 8 and 9` from out-Lside the casing'l by a Bowden wire 13, and is returned by the spring 14.

Arms 15 extend laterally from the control arm '9, and have arms l5-eXtending downwardly therefrom, which have their ends pivotallyconnected by light rods 16 with the arms 17 extending from ,thel pivotedends` vofthe walls ofthe choke tube, so that when V'the converging endsofthese walls are moved apart," owing to theair pressure thereon causedby' engine suction, the' control arm 9 effected by longitudinallyadjusting the point of contact between the control arm 9 and roller l0.Since the pivots S, 9 of the arms 8, 9'are not both in a planeperpendicular to the arms when in their normal parallel position, itfollows that when these 'of the walls 5, they will no longer be inparallelism, but will converge slightly, consequently on shifting thedistance roller l() longitudinally of the arms by the Bowden sov Wire13, the range of upward movement of the needle valve arm 8 will bevaried, movement of said roller to the right, for example, reducing` thelitt oi the arm 8 and needle valve 8', ior given lift of the arm 9.

Small grooves or passageways 5 may be provided in the pivot/ed choketube Walls Where the)T close upon the jet to pass air for running whenthe needle valve is in idling position. The flaps would then be closedon the jet tube and needle valve, and there would be no automaticmovement of the control arm 9.

.The needle valve 3 screws up and down Within a collar 23 on the needlevalve arm 8, and may be adjusted therein from outside the casting by thelrey 24- Which may be pressed down against the spring- 25 to cause a rib2G on the end ot the key to engage between upwardly extendingprojections 27 on the head. ot the needle valve.

In operation the parts of the invention function in the 'followingmanner: Assuming that an engine being supplied With fuel from thepresent carburetor and that the same is running at a low speed; thevelocity of the air passing through the chamber will be loiv, due to thepartly closed position of the butterfly valve. rlhe position of theWalls 5 under such a condition Will be partly opened or separated andthe needle valve 3 held in a slightly raised position. 'Io automaticallyand'simultaneously increase or reduce the velocity of the air andincoming flou,7 of iuel, the butterfly valve may be operated to providea greater or less opening tothe engine. The result of such an operation,it the valve is opened, Will be to cause the Walls 5 to separate to agreater extent with a consequent' increase in the volume of airpermitted to pass through the chamber.

Simultaneously With the movement of the Walls 5 there Will be a liftingmovement of the needle valve 3 through the operation of the links 16 andarms 15 to raise the arms S and 9. The proportion of air and fuel iscontrolled by movement of the Bowden Wire 13 to change the relativeposition of the roller 10 with respect to the arms 8 and 9. What I claimand desire to secure by Letters Patent of the United States is 1. In acarburetor or the character described, a casing having a choke tubetherein comprising a pair of suction operated v valls, a jet tubevprojecting Iinto the choke tube and on which said Walls 'are adapted toconverge, a needle valve controlling` the out* let`or` said jet tube,suction operated laps in the choke tube adapted to converge, means forcommunicating the movements of said Walls to the needle valve, saidmeans including a p ivoted control arm mechanically connected to thewalls, a needle valve arm carrying the needle valve and arrangedsubstantially parallel to the control arm, an adjustable member movablebetween said arms, and yieldable means acting on the needle valve arm toprevent lost motion thereof.

2. In a carburetor of the character de,- scribed, a casing having a,choke tube there. in comprising a pair of suction operated walls, a jettube projecting into the choke tube, needle valve controlling the outletof said jet tube, said Walls being adapted to converge on said j et tubeand having grooves or passages in the portions thereof Which converge onthe jet tube, means for communicating the movements of said Walls to theneedle valve, said means including a pivoted control arm mechanicallyconnected to the Walls, a. needle valve arm carrying the needle valveandl arranged substantially. parallel to the control arm, means forset'- tingthe control arm at any desired angle to the needle valve arm,and yieldable means acting on the needle' valve arm toprevent lostmotion thereof.

In testimony whereof- I have hereunto set my hand in the presence oi:lvtwo Witnesses.

HAROLD GEORGE RENNER.

Vitnesses l A. E. ALEXANDER, C. WV. ROWEDDER.

